Fly-wheel brake.



PATENTED JAN. 17, 1905.

A. G. HUBBARD.

FLY WHEEL BRAKE,

AIPLIOATION FILED MAR.2s,19o4.

NI'TE Srarns Patented January 1'?, 1905.,

ARCHIE G. HUBBARD, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR UF ONE-HALF TO BERT S. I-IUBBARD, 0F SAN FRANCISCO, CALIFURNIA.

FLYnWl-lEEL BRAKE...

SPECIFICATION forming part of Letters Patent No. 780,184, dated. January 1'?, 1905.

Application filed March 23, 1904i. Serial Not 199,593.

To tif/ZZ whom, it nea/y con/cern:

Be it known that I, ARGHIE G. HUBBARD, a citizen of the United States, residing in the city and county* of San Francisco and State of California, have invented new and useful Improvements in Fly-Wheel Brakes, of which the following is a specification.

My invention relates to a brake which is especially designed for application to fly and other wheels connected with machinery where it is desirable to make quick stops and releases.

It consists in the combination and arrangement of a brake-shoe and means for actuating' the same and in details of construction, which will be more fully explained by reference to the accompanying' drawings, in whichw Figure l is a side elevation and partial section of my invention. Fig. E2 is a side elevation of the foot-tread for throwing in the brake-block.

In the operation of job and similar printing presses and machines of like character it is often desirable or necessary that the machine be stopped very quickly on account of some accident or breakage and before a second revolution of parts can take place and to as quickly release the parts after stoppage.

It is the object of my invention to provide a brake which will fulfil these conditions.

As shown in the drawings, A is a brakeshoe of any suitable character. I have shown it as being made flat, having a suitable frictional surface and being adapted to apply to the bottom of a fly-wheel B, such as is employcd upon printing-presses. The shoe is 4carried upon a suitable support, which is of such `a character that it may be raised diagonally to the point of contact by a substantially horizontal pull upon the parts.

A preferred construction, on account of eheapness and simplicity, is to form inclines 2 upon the lower part of the shoe, and these inclines rest upon corresponding inclines 3, formed in a base 4, which may be secured to the floor or other convenient support approximately beneath the rim of the wheel to which the brake is to be applied. Connected with the front part of the shoe is a cord or equivalent device 5, the opposite end of which is conn nected with an actuating part or lever. In the present case I have shown this part as being one arm, 6, of a bell-crank lever, which lever is fulcrumed at its lower end, and the other arm, 7, serves as a convenient foot-piece, upon which the operator may place his foot atany time. Beneath this foot-piece or otherwise suitably arranged with relation to the parts is a spring 9, which normally raises the foot-piece and throws the vertical arm of the lever forward, thus releasing the brake-shoe and allowing the angular extensions to slide by gravitation upon the Alixed supports beneath, so that thel normal condition of the device of the brake-slice will be clear of the wheel. If at any time it is desirable or necessary to apply the brake, by placing the foot upon the treadle the brake-shoe will be drawn forward. This causes the inclines carried by the shoe or the equivalent angular arms to move upward, and thus lift the shoe into contact with the revolving wheel.

The incline at which the shoe is raised is s'uch that the frictional action of the shoe in contact with the wheel tends to draw the shoe still more closely into contact with the wheel, and thus stop the rotation of the latter very quickly.

The incline at which the shoe is raised is such that upon the release of the treadle the shoe will instantly drop back to its normal position and free the wheel.

In order to regulate the forward and upward movement of the shoe, I have shown an adjusting' device. This device in the present case consists of a screw passing through the rear incline 2, which slides upon the incline 3. Thus by movement of this screw, the end of which strikes the vertical stop 10, the movement of the shoe may be regulated to produce any desired frictional contact with the revoluble wheel.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination in a brake apparatus of a shoe havingI a frictional surface on one part and an inclined surface on another part, a base on which the shoe is movable, said base hava spring-pressed foot-lever and connection between it and the shoe whereby the latter is advanced and raised into contact with the wheelrim and an adjustable stop'to limit the forward movement of the shoe.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ARCHIE G. HUBBARD.

vWitnesses:

HENRY C. DROGER, JAMES L. KING. 

